diff --git a/lib/gitlab/email/receiver.rb b/lib/gitlab/email/receiver.rb
index 77ed6b9f7d9b9fadd46bf205656cb6ef166abb46..9213cfb51e8354ed99768f80f65aec717738981f 100644
--- a/lib/gitlab/email/receiver.rb
+++ b/lib/gitlab/email/receiver.rb
@@ -30,11 +30,9 @@ module Gitlab
         mail_key = extract_mail_key(mail)
         handler = Handler.for(mail, mail_key)
 
-        if handler
-          handler.execute
-        else
-          raise UnknownIncomingEmail
-        end
+        raise UnknownIncomingEmail unless handler
+
+        handler.execute
       end
 
       def build_mail